Kondo effect out of equilibrium in a mesoscopic device

J. J. Wijpkema; J. M. Elzerman; L. P. Kouwenhoven; R. Hanson; S. De Franceschi; S. Tarucha; T. Fujisawa; W. G. van der Wiel

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Kondo effect out of equilibrium in a mesoscopic device

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arxiv cond-mat/0203146 v2 pith:PELP3JOJ submitted 2002-03-07 cond-mat.mes-hall cond-mat.str-el

S. De Franceschi , R. Hanson , W. G. van der Wiel , J. M. Elzerman , J. J. Wijpkema , T. Fujisawa , S. Tarucha , L. P. Kouwenhoven This is my paper

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We study the non-equilibrium regime of the Kondo effect in a quantum dot laterally coupled to a narrow wire. We observe a split Kondo resonance when a finite bias voltage is imposed across the wire. The splitting is attributed to the creation of a double-step Fermi distribution function in the wire. Kondo correlations are strongly suppressed when the voltage across the wire exceeds the Kondo temperature. A perpendicular magnetic field enables us to selectively control the coupling between the dot and the two Fermi seas in the wire. Already at fields of order 0.1 T only the Kondo resonance associated with the strongly coupled reservoir survives.

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